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What is Telemetry?

In modern instrumentation systems, various components of the system are usually located at a vast distance from each other and, therefore it becomes necessary to transmit data between them through some communication link. Telemetry may be defined as the science of measuring at a distance and is used in industrial, commercial, military, and space operations. The term ‘telemetry’ involves the conversion of a measurand or measured magnitude, into a representative signal, the transmission of that signal over a proper channel and its reconversion into a quantitative display which may be viewed or recorded graphically or processed into a form, which may be temporarily stored, incorporated into a computation or utilized as a function of an automation process.

Telemetry systems may be classified on the basis of the characteristics of the electric signal, namely, voltage, current, position, frequency, and pulse or as analog or digital, where the signal, respectively, has been transmitted as an analog measurement or has been converted to a code representing the measurement. Voltage, current, and position telemetering operations need a physical connection between the transmitter and the receiver. This physical connection, usually referred to as channel, consists of one, two or more wires, depending on the system design. Frequency and pulse systems not only can operate over a physical wire channel but also can utilize other channels, such as telegraph, telephone, radio, or micro-wave.

The method involved for the telemetry depends upon the type of data to be transmitted and the distance over which the data is to be transmitted.

Hydraulic and pneumatic methods of data transmission are used only for short distances and, therefore, their scope is very limited. Electrical and electronic methods of data transmission can be used for long distances and, therefore, these methods are extensively used in instrumentation and measurement systems.

The telemetering systems in which the signal is transmitted through telemetering circuits such as telephone cables utilizing transformers and amplifiers. AC telemetering system is employed both for landline and radio-frequency airborne telemetry techniques. AC telemetry is employed for sensors, which provide an ac output or voltage to frequency convertors. The data is available in the form of current or voltage, which is usually very weak for such transmission. Hence it is modulated by an ac carrier, waves generated by an oscillator.

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